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# Complex.FaderSurface usage example.
import pygame, pygame.locals
from ocempgui.draw import Complex, Image
# Initialize the drawing window.
pygame.init ()
screen = pygame.display.set_mode ((120, 100))
screen.fill ((180, 180, 180))
pygame.display.set_caption ('Complex.FaderSurface')
# Create a surface we can use to display.
image = Image.load_image ("./image.png")
r = image.get_rect ()
# Create a new FaderSurface with the same dimensions and an initial
# transparency of 1.
surface = Complex.FaderSurface (r.width, r.height, 1)
# Blit the original on the FaderSurface.
surface.blit (image, (0, 0))
# The default step value is -1, but we want to fade the image in.
surface.step = 1
# Loop until the FaderSurface reached the maximum or minimum alpha
# transparency value.
while surface.update ():
# Clean up and blit the surface..
screen.fill ((180, 180, 180))
screen.blit (surface, (10, 10))
pygame.display.flip ()
# Check the bounds. We have to check the maximum values - 1, because
# 255 and 0 cause the surface to return False and we would exit the
# loop.
if surface.alpha == 254 or surface.alpha == 1:
surface.step = -surface.step
pygame.time.delay (50 / 4)
# Wait for input.
if pygame.event.get ([pygame.locals.QUIT]):
break
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